Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sys.c - pseudo-bus for system 'devices' (cpus, PICs, timers, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * 2002-3 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * This exports a 'system' bus type. | |
10 | * By default, a 'sys' bus gets added to the root of the system. There will | |
11 | * always be core system devices. Devices can use sysdev_register() to | |
12 | * add themselves as children of the system bus. | |
13 | */ | |
14 | ||
1da177e4 LT |
15 | #include <linux/sysdev.h> |
16 | #include <linux/err.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
1da177e4 | 20 | #include <linux/string.h> |
438510f6 | 21 | #include <linux/pm.h> |
f67d115f | 22 | #include <linux/device.h> |
9f3f776b | 23 | #include <linux/mutex.h> |
2ed8d2b3 | 24 | #include <linux/interrupt.h> |
1da177e4 | 25 | |
f67d115f AB |
26 | #include "base.h" |
27 | ||
1da177e4 LT |
28 | #define to_sysdev(k) container_of(k, struct sys_device, kobj) |
29 | #define to_sysdev_attr(a) container_of(a, struct sysdev_attribute, attr) | |
30 | ||
31 | ||
32 | static ssize_t | |
60530afe | 33 | sysdev_show(struct kobject *kobj, struct attribute *attr, char *buffer) |
1da177e4 | 34 | { |
60530afe ZX |
35 | struct sys_device *sysdev = to_sysdev(kobj); |
36 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
37 | |
38 | if (sysdev_attr->show) | |
4a0b2b4d | 39 | return sysdev_attr->show(sysdev, sysdev_attr, buffer); |
4a0c20bf | 40 | return -EIO; |
1da177e4 LT |
41 | } |
42 | ||
43 | ||
44 | static ssize_t | |
60530afe ZX |
45 | sysdev_store(struct kobject *kobj, struct attribute *attr, |
46 | const char *buffer, size_t count) | |
1da177e4 | 47 | { |
60530afe ZX |
48 | struct sys_device *sysdev = to_sysdev(kobj); |
49 | struct sysdev_attribute *sysdev_attr = to_sysdev_attr(attr); | |
1da177e4 LT |
50 | |
51 | if (sysdev_attr->store) | |
4a0b2b4d | 52 | return sysdev_attr->store(sysdev, sysdev_attr, buffer, count); |
4a0c20bf | 53 | return -EIO; |
1da177e4 LT |
54 | } |
55 | ||
52cf25d0 | 56 | static const struct sysfs_ops sysfs_ops = { |
1da177e4 LT |
57 | .show = sysdev_show, |
58 | .store = sysdev_store, | |
59 | }; | |
60 | ||
61 | static struct kobj_type ktype_sysdev = { | |
62 | .sysfs_ops = &sysfs_ops, | |
63 | }; | |
64 | ||
65 | ||
60530afe | 66 | int sysdev_create_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
67 | { |
68 | return sysfs_create_file(&s->kobj, &a->attr); | |
69 | } | |
70 | ||
71 | ||
60530afe | 72 | void sysdev_remove_file(struct sys_device *s, struct sysdev_attribute *a) |
1da177e4 LT |
73 | { |
74 | sysfs_remove_file(&s->kobj, &a->attr); | |
75 | } | |
76 | ||
77 | EXPORT_SYMBOL_GPL(sysdev_create_file); | |
78 | EXPORT_SYMBOL_GPL(sysdev_remove_file); | |
79 | ||
670dd90d SL |
80 | #define to_sysdev_class(k) container_of(k, struct sysdev_class, kset.kobj) |
81 | #define to_sysdev_class_attr(a) container_of(a, \ | |
82 | struct sysdev_class_attribute, attr) | |
83 | ||
84 | static ssize_t sysdev_class_show(struct kobject *kobj, struct attribute *attr, | |
85 | char *buffer) | |
86 | { | |
60530afe | 87 | struct sysdev_class *class = to_sysdev_class(kobj); |
670dd90d SL |
88 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); |
89 | ||
90 | if (class_attr->show) | |
c9be0a36 | 91 | return class_attr->show(class, class_attr, buffer); |
670dd90d SL |
92 | return -EIO; |
93 | } | |
94 | ||
95 | static ssize_t sysdev_class_store(struct kobject *kobj, struct attribute *attr, | |
96 | const char *buffer, size_t count) | |
97 | { | |
60530afe ZX |
98 | struct sysdev_class *class = to_sysdev_class(kobj); |
99 | struct sysdev_class_attribute *class_attr = to_sysdev_class_attr(attr); | |
670dd90d SL |
100 | |
101 | if (class_attr->store) | |
c9be0a36 | 102 | return class_attr->store(class, class_attr, buffer, count); |
670dd90d SL |
103 | return -EIO; |
104 | } | |
105 | ||
52cf25d0 | 106 | static const struct sysfs_ops sysfs_class_ops = { |
670dd90d SL |
107 | .show = sysdev_class_show, |
108 | .store = sysdev_class_store, | |
109 | }; | |
110 | ||
111 | static struct kobj_type ktype_sysdev_class = { | |
112 | .sysfs_ops = &sysfs_class_ops, | |
113 | }; | |
114 | ||
115 | int sysdev_class_create_file(struct sysdev_class *c, | |
116 | struct sysdev_class_attribute *a) | |
117 | { | |
118 | return sysfs_create_file(&c->kset.kobj, &a->attr); | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(sysdev_class_create_file); | |
121 | ||
122 | void sysdev_class_remove_file(struct sysdev_class *c, | |
123 | struct sysdev_class_attribute *a) | |
124 | { | |
125 | sysfs_remove_file(&c->kset.kobj, &a->attr); | |
126 | } | |
127 | EXPORT_SYMBOL_GPL(sysdev_class_remove_file); | |
128 | ||
aade4041 | 129 | static struct kset *system_kset; |
1da177e4 | 130 | |
60530afe | 131 | int sysdev_class_register(struct sysdev_class *cls) |
1da177e4 | 132 | { |
9227c47b DY |
133 | int retval; |
134 | ||
838ea8e8 BD |
135 | pr_debug("Registering sysdev class '%s'\n", cls->name); |
136 | ||
1da177e4 | 137 | INIT_LIST_HEAD(&cls->drivers); |
ef79df26 | 138 | memset(&cls->kset.kobj, 0x00, sizeof(struct kobject)); |
aade4041 | 139 | cls->kset.kobj.parent = &system_kset->kobj; |
3514faca | 140 | cls->kset.kobj.ktype = &ktype_sysdev_class; |
aade4041 | 141 | cls->kset.kobj.kset = system_kset; |
9227c47b | 142 | |
acc0e90f | 143 | retval = kobject_set_name(&cls->kset.kobj, "%s", cls->name); |
9227c47b DY |
144 | if (retval) |
145 | return retval; | |
146 | ||
38457ab3 AK |
147 | retval = kset_register(&cls->kset); |
148 | if (!retval && cls->attrs) | |
149 | retval = sysfs_create_files(&cls->kset.kobj, | |
150 | (const struct attribute **)cls->attrs); | |
151 | return retval; | |
1da177e4 LT |
152 | } |
153 | ||
60530afe | 154 | void sysdev_class_unregister(struct sysdev_class *cls) |
1da177e4 LT |
155 | { |
156 | pr_debug("Unregistering sysdev class '%s'\n", | |
157 | kobject_name(&cls->kset.kobj)); | |
38457ab3 AK |
158 | if (cls->attrs) |
159 | sysfs_remove_files(&cls->kset.kobj, | |
160 | (const struct attribute **)cls->attrs); | |
1da177e4 LT |
161 | kset_unregister(&cls->kset); |
162 | } | |
163 | ||
164 | EXPORT_SYMBOL_GPL(sysdev_class_register); | |
165 | EXPORT_SYMBOL_GPL(sysdev_class_unregister); | |
166 | ||
9f3f776b | 167 | static DEFINE_MUTEX(sysdev_drivers_lock); |
1da177e4 LT |
168 | |
169 | /** | |
170 | * sysdev_driver_register - Register auxillary driver | |
44b760a8 | 171 | * @cls: Device class driver belongs to. |
1da177e4 LT |
172 | * @drv: Driver. |
173 | * | |
44b760a8 | 174 | * @drv is inserted into @cls->drivers to be |
1da177e4 LT |
175 | * called on each operation on devices of that class. The refcount |
176 | * of @cls is incremented. | |
1da177e4 LT |
177 | */ |
178 | ||
44b760a8 | 179 | int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) |
1da177e4 | 180 | { |
44b760a8 AM |
181 | int err = 0; |
182 | ||
da009f39 | 183 | if (!cls) { |
f810a5cf | 184 | WARN(1, KERN_WARNING "sysdev: invalid class passed to " |
da009f39 | 185 | "sysdev_driver_register!\n"); |
da009f39 BD |
186 | return -EINVAL; |
187 | } | |
188 | ||
189 | /* Check whether this driver has already been added to a class. */ | |
f810a5cf AV |
190 | if (drv->entry.next && !list_empty(&drv->entry)) |
191 | WARN(1, KERN_WARNING "sysdev: class %s: driver (%p) has already" | |
da009f39 BD |
192 | " been registered to a class, something is wrong, but " |
193 | "will forge on!\n", cls->name, drv); | |
da009f39 | 194 | |
9f3f776b | 195 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
196 | if (cls && kset_get(&cls->kset)) { |
197 | list_add_tail(&drv->entry, &cls->drivers); | |
198 | ||
199 | /* If devices of this class already exist, tell the driver */ | |
200 | if (drv->add) { | |
201 | struct sys_device *dev; | |
202 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
203 | drv->add(dev); | |
204 | } | |
44b760a8 AM |
205 | } else { |
206 | err = -EINVAL; | |
f810a5cf | 207 | WARN(1, KERN_ERR "%s: invalid device class\n", __func__); |
44b760a8 | 208 | } |
9f3f776b | 209 | mutex_unlock(&sysdev_drivers_lock); |
44b760a8 | 210 | return err; |
1da177e4 LT |
211 | } |
212 | ||
213 | ||
214 | /** | |
215 | * sysdev_driver_unregister - Remove an auxillary driver. | |
216 | * @cls: Class driver belongs to. | |
217 | * @drv: Driver. | |
218 | */ | |
60530afe ZX |
219 | void sysdev_driver_unregister(struct sysdev_class *cls, |
220 | struct sysdev_driver *drv) | |
1da177e4 | 221 | { |
9f3f776b | 222 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
223 | list_del_init(&drv->entry); |
224 | if (cls) { | |
225 | if (drv->remove) { | |
226 | struct sys_device *dev; | |
227 | list_for_each_entry(dev, &cls->kset.list, kobj.entry) | |
228 | drv->remove(dev); | |
229 | } | |
230 | kset_put(&cls->kset); | |
231 | } | |
9f3f776b | 232 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
233 | } |
234 | ||
235 | EXPORT_SYMBOL_GPL(sysdev_driver_register); | |
236 | EXPORT_SYMBOL_GPL(sysdev_driver_unregister); | |
237 | ||
238 | ||
239 | ||
240 | /** | |
241 | * sysdev_register - add a system device to the tree | |
242 | * @sysdev: device in question | |
243 | * | |
244 | */ | |
60530afe | 245 | int sysdev_register(struct sys_device *sysdev) |
1da177e4 LT |
246 | { |
247 | int error; | |
60530afe | 248 | struct sysdev_class *cls = sysdev->cls; |
1da177e4 LT |
249 | |
250 | if (!cls) | |
251 | return -EINVAL; | |
252 | ||
838ea8e8 BD |
253 | pr_debug("Registering sys device of class '%s'\n", |
254 | kobject_name(&cls->kset.kobj)); | |
61030bfb | 255 | |
ef79df26 GKH |
256 | /* initialize the kobject to 0, in case it had previously been used */ |
257 | memset(&sysdev->kobj, 0x00, sizeof(struct kobject)); | |
258 | ||
1da177e4 LT |
259 | /* Make sure the kset is set */ |
260 | sysdev->kobj.kset = &cls->kset; | |
261 | ||
1da177e4 | 262 | /* Register the object */ |
61030bfb GKH |
263 | error = kobject_init_and_add(&sysdev->kobj, &ktype_sysdev, NULL, |
264 | "%s%d", kobject_name(&cls->kset.kobj), | |
265 | sysdev->id); | |
1da177e4 LT |
266 | |
267 | if (!error) { | |
60530afe | 268 | struct sysdev_driver *drv; |
1da177e4 | 269 | |
838ea8e8 BD |
270 | pr_debug("Registering sys device '%s'\n", |
271 | kobject_name(&sysdev->kobj)); | |
272 | ||
9f3f776b | 273 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
274 | /* Generic notification is implicit, because it's that |
275 | * code that should have called us. | |
276 | */ | |
277 | ||
1da177e4 LT |
278 | /* Notify class auxillary drivers */ |
279 | list_for_each_entry(drv, &cls->drivers, entry) { | |
280 | if (drv->add) | |
281 | drv->add(sysdev); | |
282 | } | |
9f3f776b | 283 | mutex_unlock(&sysdev_drivers_lock); |
79f0313b | 284 | kobject_uevent(&sysdev->kobj, KOBJ_ADD); |
1da177e4 | 285 | } |
838ea8e8 | 286 | |
1da177e4 LT |
287 | return error; |
288 | } | |
289 | ||
60530afe | 290 | void sysdev_unregister(struct sys_device *sysdev) |
1da177e4 | 291 | { |
60530afe | 292 | struct sysdev_driver *drv; |
1da177e4 | 293 | |
9f3f776b | 294 | mutex_lock(&sysdev_drivers_lock); |
1da177e4 LT |
295 | list_for_each_entry(drv, &sysdev->cls->drivers, entry) { |
296 | if (drv->remove) | |
297 | drv->remove(sysdev); | |
298 | } | |
9f3f776b | 299 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 | 300 | |
c10997f6 | 301 | kobject_put(&sysdev->kobj); |
1da177e4 LT |
302 | } |
303 | ||
304 | ||
305 | ||
306 | /** | |
307 | * sysdev_shutdown - Shut down all system devices. | |
308 | * | |
309 | * Loop over each class of system devices, and the devices in each | |
310 | * of those classes. For each device, we call the shutdown method for | |
44b760a8 | 311 | * each driver registered for the device - the auxillaries, |
1da177e4 LT |
312 | * and the class driver. |
313 | * | |
314 | * Note: The list is iterated in reverse order, so that we shut down | |
ee6921f7 | 315 | * child devices before we shut down their parents. The list ordering |
1da177e4 LT |
316 | * is guaranteed by virtue of the fact that child devices are registered |
317 | * after their parents. | |
318 | */ | |
1da177e4 LT |
319 | void sysdev_shutdown(void) |
320 | { | |
60530afe | 321 | struct sysdev_class *cls; |
1da177e4 LT |
322 | |
323 | pr_debug("Shutting Down System Devices\n"); | |
324 | ||
9f3f776b | 325 | mutex_lock(&sysdev_drivers_lock); |
aade4041 | 326 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 327 | struct sys_device *sysdev; |
1da177e4 LT |
328 | |
329 | pr_debug("Shutting down type '%s':\n", | |
330 | kobject_name(&cls->kset.kobj)); | |
331 | ||
332 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
60530afe | 333 | struct sysdev_driver *drv; |
1da177e4 LT |
334 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
335 | ||
44b760a8 | 336 | /* Call auxillary drivers first */ |
1da177e4 LT |
337 | list_for_each_entry(drv, &cls->drivers, entry) { |
338 | if (drv->shutdown) | |
339 | drv->shutdown(sysdev); | |
340 | } | |
341 | ||
342 | /* Now call the generic one */ | |
343 | if (cls->shutdown) | |
344 | cls->shutdown(sysdev); | |
345 | } | |
346 | } | |
9f3f776b | 347 | mutex_unlock(&sysdev_drivers_lock); |
1da177e4 LT |
348 | } |
349 | ||
ceaeade1 SL |
350 | static void __sysdev_resume(struct sys_device *dev) |
351 | { | |
352 | struct sysdev_class *cls = dev->cls; | |
353 | struct sysdev_driver *drv; | |
354 | ||
355 | /* First, call the class-specific one */ | |
356 | if (cls->resume) | |
357 | cls->resume(dev); | |
62b01247 RW |
358 | WARN_ONCE(!irqs_disabled(), |
359 | "Interrupts enabled after %pF\n", cls->resume); | |
ceaeade1 SL |
360 | |
361 | /* Call auxillary drivers next. */ | |
362 | list_for_each_entry(drv, &cls->drivers, entry) { | |
363 | if (drv->resume) | |
364 | drv->resume(dev); | |
62b01247 RW |
365 | WARN_ONCE(!irqs_disabled(), |
366 | "Interrupts enabled after %pF\n", drv->resume); | |
ceaeade1 | 367 | } |
ceaeade1 | 368 | } |
1da177e4 LT |
369 | |
370 | /** | |
371 | * sysdev_suspend - Suspend all system devices. | |
372 | * @state: Power state to enter. | |
373 | * | |
65151365 | 374 | * We perform an almost identical operation as sysdev_shutdown() |
1da177e4 LT |
375 | * above, though calling ->suspend() instead. Interrupts are disabled |
376 | * when this called. Devices are responsible for both saving state and | |
377 | * quiescing or powering down the device. | |
378 | * | |
379 | * This is only called by the device PM core, so we let them handle | |
380 | * all synchronization. | |
381 | */ | |
438510f6 | 382 | int sysdev_suspend(pm_message_t state) |
1da177e4 | 383 | { |
60530afe | 384 | struct sysdev_class *cls; |
ceaeade1 SL |
385 | struct sys_device *sysdev, *err_dev; |
386 | struct sysdev_driver *drv, *err_drv; | |
387 | int ret; | |
1da177e4 | 388 | |
2ed8d2b3 RW |
389 | pr_debug("Checking wake-up interrupts\n"); |
390 | ||
391 | /* Return error code if there are any wake-up interrupts pending */ | |
392 | ret = check_wakeup_irqs(); | |
393 | if (ret) | |
394 | return ret; | |
395 | ||
62b01247 RW |
396 | WARN_ONCE(!irqs_disabled(), |
397 | "Interrupts enabled while suspending system devices\n"); | |
398 | ||
1da177e4 LT |
399 | pr_debug("Suspending System Devices\n"); |
400 | ||
aade4041 | 401 | list_for_each_entry_reverse(cls, &system_kset->list, kset.kobj.entry) { |
1da177e4 LT |
402 | pr_debug("Suspending type '%s':\n", |
403 | kobject_name(&cls->kset.kobj)); | |
404 | ||
405 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
406 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
407 | ||
44b760a8 | 408 | /* Call auxillary drivers first */ |
1da177e4 | 409 | list_for_each_entry(drv, &cls->drivers, entry) { |
ceaeade1 SL |
410 | if (drv->suspend) { |
411 | ret = drv->suspend(sysdev, state); | |
412 | if (ret) | |
413 | goto aux_driver; | |
414 | } | |
62b01247 RW |
415 | WARN_ONCE(!irqs_disabled(), |
416 | "Interrupts enabled after %pF\n", | |
417 | drv->suspend); | |
1da177e4 LT |
418 | } |
419 | ||
420 | /* Now call the generic one */ | |
ceaeade1 SL |
421 | if (cls->suspend) { |
422 | ret = cls->suspend(sysdev, state); | |
423 | if (ret) | |
424 | goto cls_driver; | |
62b01247 RW |
425 | WARN_ONCE(!irqs_disabled(), |
426 | "Interrupts enabled after %pF\n", | |
427 | cls->suspend); | |
ceaeade1 | 428 | } |
1da177e4 LT |
429 | } |
430 | } | |
431 | return 0; | |
ceaeade1 SL |
432 | /* resume current sysdev */ |
433 | cls_driver: | |
434 | drv = NULL; | |
435 | printk(KERN_ERR "Class suspend failed for %s\n", | |
436 | kobject_name(&sysdev->kobj)); | |
437 | ||
438 | aux_driver: | |
439 | if (drv) | |
440 | printk(KERN_ERR "Class driver suspend failed for %s\n", | |
441 | kobject_name(&sysdev->kobj)); | |
442 | list_for_each_entry(err_drv, &cls->drivers, entry) { | |
443 | if (err_drv == drv) | |
444 | break; | |
445 | if (err_drv->resume) | |
446 | err_drv->resume(sysdev); | |
447 | } | |
ceaeade1 | 448 | |
ceaeade1 SL |
449 | /* resume other sysdevs in current class */ |
450 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { | |
451 | if (err_dev == sysdev) | |
452 | break; | |
453 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
454 | __sysdev_resume(err_dev); | |
455 | } | |
456 | ||
457 | /* resume other classes */ | |
aade4041 | 458 | list_for_each_entry_continue(cls, &system_kset->list, kset.kobj.entry) { |
ceaeade1 SL |
459 | list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) { |
460 | pr_debug(" %s\n", kobject_name(&err_dev->kobj)); | |
461 | __sysdev_resume(err_dev); | |
462 | } | |
463 | } | |
464 | return ret; | |
1da177e4 | 465 | } |
0f99fed4 | 466 | EXPORT_SYMBOL_GPL(sysdev_suspend); |
1da177e4 LT |
467 | |
468 | /** | |
469 | * sysdev_resume - Bring system devices back to life. | |
470 | * | |
65151365 | 471 | * Similar to sysdev_suspend(), but we iterate the list forwards |
1da177e4 LT |
472 | * to guarantee that parent devices are resumed before their children. |
473 | * | |
474 | * Note: Interrupts are disabled when called. | |
475 | */ | |
1da177e4 LT |
476 | int sysdev_resume(void) |
477 | { | |
60530afe | 478 | struct sysdev_class *cls; |
1da177e4 | 479 | |
62b01247 RW |
480 | WARN_ONCE(!irqs_disabled(), |
481 | "Interrupts enabled while resuming system devices\n"); | |
482 | ||
1da177e4 LT |
483 | pr_debug("Resuming System Devices\n"); |
484 | ||
aade4041 | 485 | list_for_each_entry(cls, &system_kset->list, kset.kobj.entry) { |
60530afe | 486 | struct sys_device *sysdev; |
1da177e4 LT |
487 | |
488 | pr_debug("Resuming type '%s':\n", | |
489 | kobject_name(&cls->kset.kobj)); | |
490 | ||
491 | list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) { | |
1da177e4 LT |
492 | pr_debug(" %s\n", kobject_name(&sysdev->kobj)); |
493 | ||
ceaeade1 | 494 | __sysdev_resume(sysdev); |
1da177e4 LT |
495 | } |
496 | } | |
497 | return 0; | |
498 | } | |
0f99fed4 | 499 | EXPORT_SYMBOL_GPL(sysdev_resume); |
1da177e4 LT |
500 | |
501 | int __init system_bus_init(void) | |
502 | { | |
aade4041 GKH |
503 | system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj); |
504 | if (!system_kset) | |
505 | return -ENOMEM; | |
506 | return 0; | |
1da177e4 LT |
507 | } |
508 | ||
509 | EXPORT_SYMBOL_GPL(sysdev_register); | |
510 | EXPORT_SYMBOL_GPL(sysdev_unregister); | |
9800794a AK |
511 | |
512 | #define to_ext_attr(x) container_of(x, struct sysdev_ext_attribute, attr) | |
513 | ||
514 | ssize_t sysdev_store_ulong(struct sys_device *sysdev, | |
515 | struct sysdev_attribute *attr, | |
516 | const char *buf, size_t size) | |
517 | { | |
518 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
519 | char *end; | |
520 | unsigned long new = simple_strtoul(buf, &end, 0); | |
521 | if (end == buf) | |
522 | return -EINVAL; | |
523 | *(unsigned long *)(ea->var) = new; | |
4e318d7c AK |
524 | /* Always return full write size even if we didn't consume all */ |
525 | return size; | |
9800794a AK |
526 | } |
527 | EXPORT_SYMBOL_GPL(sysdev_store_ulong); | |
528 | ||
529 | ssize_t sysdev_show_ulong(struct sys_device *sysdev, | |
530 | struct sysdev_attribute *attr, | |
531 | char *buf) | |
532 | { | |
533 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
534 | return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(sysdev_show_ulong); | |
537 | ||
538 | ssize_t sysdev_store_int(struct sys_device *sysdev, | |
539 | struct sysdev_attribute *attr, | |
540 | const char *buf, size_t size) | |
541 | { | |
542 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
543 | char *end; | |
544 | long new = simple_strtol(buf, &end, 0); | |
545 | if (end == buf || new > INT_MAX || new < INT_MIN) | |
546 | return -EINVAL; | |
547 | *(int *)(ea->var) = new; | |
4e318d7c AK |
548 | /* Always return full write size even if we didn't consume all */ |
549 | return size; | |
9800794a AK |
550 | } |
551 | EXPORT_SYMBOL_GPL(sysdev_store_int); | |
552 | ||
553 | ssize_t sysdev_show_int(struct sys_device *sysdev, | |
554 | struct sysdev_attribute *attr, | |
555 | char *buf) | |
556 | { | |
557 | struct sysdev_ext_attribute *ea = to_ext_attr(attr); | |
558 | return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); | |
559 | } | |
560 | EXPORT_SYMBOL_GPL(sysdev_show_int); | |
561 |